บทที่ 5 การอนุรัก ... - dede.go.th

1 5 5-1 5 1. 2. 5 5-2 ( ) (Equivalent Boiler Capacity) / (Ton/hr) (Japan kg/hr)

2 1 / 1,000 kg 100oC 1 1,000 / . BHp (USA) 1 212 oF 1 / . / 1 ton/hr = (1, ) = BHp (kJ/hr) = mhfg ( ) m = (kg/hr) hfg = Latent heat of water at atmospheric pressure ( 2,257 kJ/kg ) 5 5-3 (Actual Boiler Capacity) (Catalog)

3 100 oC ( ) 100 oC 10-20 % (Enthalpy) (Enthalpy) (Latent Heat) = fgfghhatmospherehm )( m (kg/hr) hfg (Latent heat) (2,257 kJ/kg) hg (Enthalpy) (kJ/kg) hf (Enthalpy) (kJ/kg)

4 10 / 2 (Actual Evaporation) ( ) 5 5-4 (Equivalent Evaporation)

5 100 oC ( 539 kcal/kg 2,257 kJ/kg) F&A (From&AT) Factor of Evaporation = 539)'(hhG G (kg/h) h (kcal/kg) h ( ) kcal/kg 10 kg/cm2G 50 oC 5 / [ ( ) (hg) 10 kg/ cm2G kcal/kg] = = 5,000 x = 5,700 kg/ [ ] 5,000 x ( 50)

6 539 5 5-5 = (kg/h, t/h) (kg/h, Nm3/h) = x hg ht 1 7 kg/cm2G 50 C C 9,818 kcal/ 85% 15 / 1 ( ) ( ) = 9,818 x - 50 = kg / 1 1 = 1,000 kg = 1 = x 15 = 1,099 / 6 C 1 % Blowdown 6,000 kg/.

7 TDS 370 ppm TDS 3,500 ppm Bd. Blowdown rate = TDS x TDS TDS = = 709 kg/ . TDS 2,500 ppm Bd. 370 x 6,000 3,500 370 5 5-6 = 370 x 6,000 2,500 370 = 1,042 kg/.

8 Over Bd. = 1,042 709 kg/ . = 333 kg/ . Blowdown . Blowdown = 333 kg/ . 7 barG . 7 barG = 721 kJ/kg . = 333 kg/ . x 721 kJ/kg = 240,093 kJ/kg . ( ) = 85 % . = 41,100 KJ/ ( 15 / ) . = 240,093 x 15 41,100 x = 103 /.

9 1 = 103 x 24 x 300 = 741,600 / (Air-Fuel Ratio) Stoichiometric Combustion C8H18 + O2 8 CO2 + 9 H2O C = 12.

10 H = 2 O = 16 1 C8H18 132 400 21% 5 5-7 Air / Fuel Ratio = 400 / 21% 132 = C2H5 OH C2H5 OH + 6 O2 2 CO2 + 3 H2O C2H5 OH 52 6 96 Air / Fuel Ratio = 96 / 21% 52 = Stoichiometry 5 5-8 Stoichiometry 3